. >>> but we'll start in kansas city where the linebacker jovan belcher was supposed to take the field for the chiefs, but that's not going to happen. police said that he killed his girlfriend on saturday. and then killed himself in front of his coach. caught in the middle here the most innocent conceivable victim, the couple's 3-month-old baby girl. abc's john schriffen is inside arrowhead stadium where today's game will still be played. >> reporter: dan, good morning. this morning, we're learning more about what may have happened in the hours leading up to this tragedy. according to the kansas city star, it all started 1:00 saturday morning when belcher's girlfriend got home late from a concert that she attended with friends. well, tragically, it ended seven hours later. when belcher shot her several times, and he then drove to the chiefs stadium where he then took his own life. this morning, investigators are trying to figure out why nfl linebacker jovan belcher killed his 22-year-old girlfriend and then took his own life. >> we heard that they had been arguing in the past. as far a